**Recent forecast guidance from the Korea Meteorological Administration and models like those used by AccuWeather points to a daily maximum near 27–29°C in Busan on June 21, reflecting the typical early-summer pattern of rising temperatures moderated by coastal sea breezes.** Busan’s location on the southeastern coast introduces marine influence that often caps highs several degrees below inland areas, while increasing humidity and variable cloud cover—driven by weak pressure gradients ahead of the East Asian monsoon—can either enhance or suppress afternoon heating. Light easterly or southerly flow favors modest warming, whereas any increase in onshore winds or scattered showers would favor the lower end of the distribution. Ensemble spreads and day-to-day model updates remain the key variables that could shift the most likely outcome between 28°C and 29°C before resolution.